Download resumption - Preliminary

chrome/browser/download/download_shelf_context_menu.cc

Index: chrome/browser/download/download_shelf_context_menu.cc
diff --git a/chrome/browser/download/download_shelf_context_menu.cc b/chrome/browser/download/download_shelf_context_menu.cc
index 095ca155c811fff5db92d9fc7b87261a2159084f..db2aa0c911ca0cbe3d1446d029cb1318ca4cb553 100644
--- a/chrome/browser/download/download_shelf_context_menu.cc
+++ b/chrome/browser/download/download_shelf_context_menu.cc
@@ -4,12 +4,14 @@
 
 #include "chrome/browser/download/download_shelf_context_menu.h"
 
+#include "base/command_line.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/download/download_crx_util.h"
 #include "chrome/browser/download/download_item_model.h"
 #include "chrome/browser/download/download_prefs.h"
 #include "chrome/browser/safe_browsing/download_protection_service.h"
 #include "chrome/browser/safe_browsing/safe_browsing_service.h"
+#include "chrome/common/chrome_switches.h"
 #include "chrome/common/extensions/extension.h"
 #include "chrome/common/extensions/extension_switch_utils.h"
 #include "content/public/browser/download_item.h"
@@ -47,6 +49,8 @@ ui::SimpleMenuModel* DownloadShelfContextMenu::GetMenuModel() {
 }
 
 bool DownloadShelfContextMenu::IsCommandIdEnabled(int command_id) const {
+  static bool restart_enabled = CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kEnableDownloadResumption);
   switch (command_id) {
     case SHOW_IN_FOLDER:
       return download_item_->CanShowInFolder() &&
@@ -66,7 +70,7 @@ bool DownloadShelfContextMenu::IsCommandIdEnabled(int command_id) const {
     case CANCEL:
       return download_item_->IsPartialDownload();
     case TOGGLE_PAUSE:
-      return download_item_->IsInProgress();
+      return restart_enabled && download_item_->CanResumeDownload();
     default:
       return command_id > 0 && command_id < MENU_LAST;
   }
@@ -165,8 +169,11 @@ string16 DownloadShelfContextMenu::GetLabelForCommandId(int command_id) const {
     case CANCEL:
       return l10n_util::GetStringUTF16(IDS_DOWNLOAD_MENU_CANCEL);
     case TOGGLE_PAUSE: {
-      if (download_item_->IsPaused())
+      if (download_item_->IsPaused() ||
+          (download_item_->CanResumeInterrupted() !=
+              DownloadItem::RESUME_MODE_INVALID)) {
         return l10n_util::GetStringUTF16(IDS_DOWNLOAD_MENU_RESUME_ITEM);
+      }
       return l10n_util::GetStringUTF16(IDS_DOWNLOAD_MENU_PAUSE_ITEM);
     }
     case DISCARD: